Cut-out



July 3, 1923.

C. F. GILCHRIST CURRENT CUT-OUT Filed Jan. 24

@mwa/dot C/a/ewce /F' 6776/2/15/ @no1/m :SER

` by the devices* descri' Patented July 3, 1923.

UNITEDl STATESk PATENT. OFFICE.

, Gunmen r. Gnomes, or romano, omo, assioma ro man ELECTRIC eurams comm, or Tomo, omo, aconronaa'ron or omo.

Application` lled anuaxyiu, 1918. Serial No. 213,526.

Toallswhm itmy concern:

'Be it."known that I, GLennNon F. 'G 1L cn'msr, a-clzen of the United States, res1ding at Toledo: the county of Lucas and State of Ohio, bavejinvented certain newand useful Improvements 'iuCurrent- Cut-Oufs,'

the discharge-ofthe batteryjthrou'ghths dynemo when' tlie'latter is `motionless or opentage; For? this purpose, an "elmo-magneticswitch islcom'mnly employed inf' the form of a'evers'e-current'cut-out' which has the additional 4fur'iction of preventing chatterin ofthe contact oinls. l f

A eprincipal' o 'iectoft invention 1s to provide a. cut-out of thgs'ahove named type, which'will have a quick breakat the time ofdiscnn'vction. 4

Another object is to provide a switch with a magnetic circuit of relatively 'small structural dimensions',but` 'so arranged as to remain unsaturated at all generatorvvollgesA belwthatft which' the device is intend operate.

Further objects, and'objects relatlngto economies of manufacture and details of construction',wi1l deiinitel appear from the' detaileddescrption to fo ow.

`I accomplish the obects of my Invention ed inthe following speciiication.

A structure constituting a preferred embodiment of'my invention is illustrated in the'accompanying drawings, forming a part of this specification. in whichv Fg'LI isa plan view of a structure embodymg my invention.

II'is a vertical sectlon through the device taken on the line II-.II of Fig. I.

Fig. III is an end view of the structure with the casing in section.

Fig. IV is a view of the base showing the terminals. f Y

Fig. V is a detail l perspective view of the contact plate, and

Fi VIis a view showing the various electrice circuits and connections.

yIn the drawings, similar reference numerals refer to similar parts throughout the several views,"and the sectional views are taken loo in the directon of the arrows at the ends o the section lines.

-s-illustrated, particularly in Flo. II, the base plate-hasmonted thereon, a shaped strip- 1 offsoft iron which is adapted to relceive the electro-'InagiletV 2 'and which is insulated from the base by means of thc'fbreplates 3 and 4 and Yheld 4in place bythe c'ore rivet 6; The end 6 of the strip is'bentutwardly and the thin metal strip 7 aidleaf spring4 8 riveted thereto.

'Intermediate' the ends of the U-shaped strip lis placed the armature 9 of the electre-magnet,4 which consists of a flat plate of soft'irn with one end riveted tothe metal strip'l "T,- and the other end narrowed as at 10,-

to form 'a base for one o'f the silvered contact points-'11. In the body of the armature plate, a't'on ue=12 is struck out under which the termina *of 'the spring 8 is seated, normally forcing the armature outwardly.

An'L-s'hd plate 13 is attached to the Ustrip 1," rough-insulation plates 14 and 15 by'mea'n'sfof a screwf16. 0n the outward Iy extendingaur of the plate, a second silveredcontact-l is'seur'ed, which is adapted to'coutact with -tlie first named contact plate when vthe armature is depressed.

Fastened also to the Ulshaped strip 1 is a small v'plate 18 of non-magnetic material, such as brass, which has its upper end extending above the U-strip end, and terminating'n a T-shap'ed head 19. A T-shaped slot iscutin the armature 9 at a int adjacent the head 19,' and in the wide end of which 'slot'tthe head of the T is inserted and bent into the narrowed portion, thereby aifording a limiting stop for the outward movement of the armature.

The electro-magnet 2 has a core of soft iron about which two coils of insulated wire are wound, one of'large size and relatively few turns, forming the `series coil in the char circuit, and the 'other of small size and aving a relatively large number of turns, forming a shunt coil in the generator circuit. The series coil has one end soldered on the Lplate 13 at 21, and the other end is brought out throu h the insulation late in the base and sol ered to the terminal 22.

-. generate; .has

From L-plnte the; series cimuit pasfses throughhe contact points l1 -nd 17; the

armature 9, U-strip l, rivet 5 connecting plate 2 3 to the bae terminal 24. The yshunt con hts' @ha geleend te che bsepn, formin s. roun'dthreivifh; and the other end sol ere on the series terminal 24e .'lhe iron magnetic circuit is prefernbl co per plated todprevent oxidgtionf e w ole is enclose in e sheet metal casing, the lower edges o f whichlt closely over the base sides, an are secured thereto.

The gperetonofthedevice is es fol lows: Normally, s eries circuit is broken :it the ,pon xthus preventing current dis- 'charge from elzgattery. hen the engine is started, the generator voltage increases rapidln .forcing-increasing current .through the hunt'coil ofthe electro-magnet. Owing. to the, ironircuit, the magnetic flux may Pzremfheorehmueh thf Sid@ 25 `ox; 26, nnd consequently the erms'ofrthe Llfetr' 1 mty be made of smaller dimensions than woulzlbe oeeiblefif one armonly were u sedns a con 4noting path, inasmuch es a single arm of the -semedmensions would become saturated before the point had been r edjor the contente toclose. When the veltegeidu; te theneresmg Speed -Of' the slightlygreater than the hettery,yoltege,; the coitacts 11 and 17 n'rillclosennd-` current gyilL ow into the heb tery it. en the en 'neslows down,1 the colnbined .s e r1es and s unt currents meinfnfinthe contacts in closed tposit-ion int'heloipthat a.t which oontact ivan-.gne c byhe shunt coilnloneyso tiret1 e small reverse lc| n'veng. ,-will dow througlihe series windlng., chattering of to a voltge ,the contacts is thereby preventei- It; hns already been no ted that tivo mcgnctic .'pthsf25 ,and 26 are provided in the electroqiignet, reluctance of path 25 is only slightl;I greater ith:m ath 26 when the armature 1s attracted as t e airi ,at thefulcrum end of the armature is shtly greeter, than that at thecontect end1 end in consequence, at the moment of break at the contacts, the maneticllugr through the fpath 26 is,reudily'shiftccl to the path 25o approximately equivalent reluctance, thereby permitting a quick break et the contact points with u corresponding decrease in the ercing effects.

It should be noted that the structure is exceeding -co,uipa .ct in forni, has comperativcly few detachable parts, thus making the .cut-out of brent value where economy of spaccfand Weiglit and solid Structure are es Scntinl.

I am aware thet the particular embodimentf my inyention, herein shown and described. is susceptible of considerable variation without departing from the spirit of the invention, and, therefore, l desire to claim the same broadly, ae well as; specifically, 'ns indicated b the appended clims, Having thus descmbed :ny invention, what l claim as, nen and desire to secure by Letters P''tengis: 1. l'n :In electro-m combination of a meta base; a U-shapcd iron strip attached thereto and insulated therefrom; en electro-magnet having n core within said strip; sin armature having an opening therein attached to an arm of said U- shuped strip, seid nneture carrying a contactplerg seond contnct plate at tnchcd to, md insulu.ted from, the other end of seid Uchnped gtrip; said electro-magnet adapted when energilted tqcnuge s aid contact platcetocloee; means normali)r Vretaininfr the contact plates in disengegement; end a itionnl means .by thellrehapecl strip and .projegting: thru the oLning u1 the armature for limiting distance of separationlofthe contactpletes.

2.111 en elech'ezmgrwtic embout, fb@ combination of u coe; o. plumlity of solenoids sutromidin seid core, compri sing a seriee cgil and ag untcoil; :1 gnlmpied .iron strip 'renewed About Saisloeneids e 6.01.1- wctnete on @mem-m Qi .sind Strip meule@ therefrom, Ain geriesnwnththeeries coil; an. #mme @Home .e Swed emtswt plaie Secured@ t e ether'm 0f `eid Strip; mee' for norma holding the armeture away froinvsnidolenoid, and contact plates in disen gement; seidphiintcoilwhen ener rized ingledopted to close un electric ,circuit throu l1 the contact, Vthe llu; vof said shunt coil: ollowing n magnetic circuit ofthe U-shnped strip and efic cut out, the

through each erm the said armature.

3. In an electro magnetic cut-put, the combinationof a core; nplurality of eclenoicls surroundinvseid -;corc, comprising a series coil and a, siuntcoiln U-sl1ape d iron strip positioned about said solenoids; neontact plateau one arm of said stinginsulated therefrom, and in serieswitli the series coil; an armature carrying n second contact plate secured to the othernrm of said strip; means for normally` holdin the Contact plates in disengagement; said Ashunt coil when ener'fizcd being adapted to close an electrical circuit through the contacts, armature, and one arm o the U-shaped strip1 and to close n magnetic circuit thro Uh :ii-mature :ind euch arm of the Ul-lsrhnped strip. the reluctnnces of said magneticcircuits being approximately equal when contacts are closed and. the reluctance ofg'the magnetic circuit thru the arm earning the contact plate being greater than thev reluctuin-e of the umgnetic circuit thru the-other ux'm when the contacts are open.

4. ln :in electro-magnetic cutout` thc combination of n core, a coil thereon, av inabnetic member nt one end thereof having an moose:

arm, extendn along each side thereof, an armature at t e opposite end of said coil, means for securing one end of said amature to one of said arms, a contact carried by said other arm, a co-operating contact carried by the adjacent end of said armature, said magnetic member and said armature providing a pair of return paths for the fiux of said coil, Y

5. In anY electro-magnetic cut-ont, the combination of a core, a coil thereon, a magnetic member having portions extending across one end and up each side thereof, an

4 armature Hexibly secured to one of said side portions and extending in proximity to each of said side portions, a stationary contact, a movable contact carried by said armature and means secured to the other of said side portions for limiting the movement of said armature away from said coil.

` 6. In an electro magnetic cut-out, the combination of a core, a coil thereon, a magnetic member havi ipontions extending across one end and a ong each side thereof,

an armature flexibly secured to one of said side portions and magnetically related to both of said side portions, a contact member secured to the outer face of the other of said portions having an outwardly extending contact arm, said amature having an out- Wardly extending portion provided with a contact point to fio-operate with said contact arm.

7. In an electro-magnetic cut-out, the combination of a base, a substantiall U- shaped magnetic strip secured to and insulated from said base, an electromagnet positioned Within said U-shaped strip, an arma ture for said magnet substantially bridging the arms of said strip and a fiat spring connecting said armature to one of said arms for retracting the armature, a stationary contact member insulated from said strip and a co-operating contact member carried by said armature.

In testimony whereof I alix my signature.

CLARENCE F. GILGHRIST. 

